This endpoint updates an already existing customer object
Basic authentication header of the form Basic <encoded-value>, where <encoded-value> is the base64-encoded string username:password.
Phone contact details
Billing Details of the customer
Shipping Details of the customer
Set of key-value pairs that can be attached to the object (JSON string format)
"{\"key1\": \"value1\", \"key2\": \"value2\"}"
Customer id for which details need to be updated.